如何使用JOIN和WHERE語句過濾記錄？

Question

我的查詢

SELECT table1.name, table2.wage, table2.bonus table3.shift, table4.vacation
   FROM table1
INNER JOIN table2 ON table1.userid = table2.userid
INNER JOIN table3 ON table2.userid = table3.userid
INNER JOIN table4 ON table4.userid = table4.userid 
LEFT JOIN table5 ON table1.name = table5.position
**LEFT JOIN vacation on vacation.userid = table1.userid
WHERE vacation.userid IS NULL**;

這將選擇所有用戶ID不在假期表中的位置。

現在，我需要檢查用戶ID是否在假期表中，並且該userid vacation.status = 1是否仍應顯示在查詢中。

Answer 1

如果這是一個單獨的查詢/要求，那么以下查詢將起作用：

SELECT table1.name, table2.wage, table2.bonus table3.shift, table4.vacation
   FROM table1
INNER JOIN table2 ON table1.userid = table2.userid
INNER JOIN table3 ON table2.userid = table3.userid
INNER JOIN table4 ON table4.userid = table4.userid 
INNER JOIN vacation on vacation.userid = table1.userid
LEFT JOIN table5 ON table1.name = table5.position
WHERE vacation.status = 1;

如果您同時需要這兩個要求（用戶標識為NULL或狀態= 1），請嘗試以下操作：

SELECT table1.name, table2.wage, table2.bonus table3.shift, table4.vacation
   FROM table1
INNER JOIN table2 ON table1.userid = table2.userid
INNER JOIN table3 ON table2.userid = table3.userid
INNER JOIN table4 ON table4.userid = table4.userid 
LEFT JOIN table5 ON table1.name = table5.position
LEFT JOIN vacation on vacation.userid = table1.userid
WHERE vacation.user_id IS NULL or vacation.status = 1;